One could land in jail for up to a year for making a false promise.

RS 14:125

False swearing

False swearing is the intentional making of a written or oral statement, known to be false, under sanction of an oath or an equivalent affirmation, where such oath or affirmation is required by law; provided that this article shall not apply where such false statement is made in, or for use in, a judicial proceeding or any proceeding before board or official, wherein such board or official is authorized to take testimony.

Whoever commits the crime of false swearing shall be fined not more than five hundred dollars, or imprisoned for not more than one year, or both.